SIMPLER boundary condition

Ambrose

Well, actually I have very similar problems as Ramesh does. Mine is steady, incompressible, Poiseulle-Couette flow with Re=100. Uniform flow in and fully developed flow out with no information on Pressure; pressure at exit is not given. The problem is that the axial velocity profile at exit is decreasing as the length of the pipe is getting longer; 10% error. One of the things that I suspect is the mass is decreasing from the inlet to exit. Also, have to keep relaxation factor for velocities very small like less than 0.1. Surprisingly, results are really good with 0.01. However, I have no idea why. I looked at my codes very carefully again and again, but everything looks fine. I appreciate any comments.

Ambrose